Thermal Properties of Promethium and Neptunium
Specific Heat
0.18 J/(kg K)
  
33
0.12 J/(kg K)
  
40
Molar Heat Capacity
Not Available
  
29.46 J/mol·K
  
8
Thermal Conductivity
17.90 W/m·K
  
99+
6.30 W/m·K
  
99+
Critical Temperature
Not Available
  
Not Available
  
Thermal Expansion
9.00 µm/(m·K)
  
99+
Not Available
  
Enthalpy
  
  
Enthalpy of Fusion
7.50 kJ/mol
  
99+
3.20 kJ/mol
  
99+
Enthalpy of Atomization
310.00 kJ/mol
  
34
Not Available
  
Standard Molar Entropy
Not Available
  
Not Available